After three average seasons in Catalonia, ranking between positions 9–13,[8] Maguregui returned to Racing, helping it to top flight promotion in his first year and going on to remain with the club a total of nine years, being the manager with more games at its service.[3] He worked with Celta in the 1987–88 season, also in the first division, being dismissed in round 30 due to the surmounting pressure after his agreement with Atlético Madrid for the following campaign.[9]

Maguregui was fired by the Colchoneros in early October 1988 in spite of two consecutive home wins, 3–0 against Cádiz CF for the league and 2–1 over FC Groningen for the UEFA Cup (away goals rule elimination), being one of four coaches used by the club during the season (elusive Jesús Gil was the chairman) which saw the team finish in fourth place.[10] He concluded the campaign with fellow first-divisioner Real Murcia,[11] which suffered relegation.[12]

Maguregui's last job at the professional level was with Celta, with the coach arriving in Galicia late into 1989–90 – which ended in top flight relegation – and leaving 18 games into the following season.[4]

Death

Maguregui died on 30 December 2013 at the age of 79 in Bilbao, after a long battle with illness. In his last public appearance, in June, he attended the inauguration of the new San Mamés.[1][13]